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Evaporator core replacement is a planning job as much as a repair, and Route 66 Auto Repair in Upland treats it that way. Once a leak is proven at the core, the car is usually with us for more than a day while the dashboard comes out. This page covers what you decide before we start, how we protect your interior, and what you should check when you pick it up.
What should you decide before the dash comes out?
Most of the cost is labor to reach the core. That labor overlaps with other parts in the same box, so the smart time to replace them is now. Each option gets its own line on the estimate, and you choose. Our AC evaporator replacement page explains how the leak gets proven; this is about the job once it is.
- Heater core, if it is original on a high-mileage vehicle
- Blend and mode door actuators that already click or lag
- Expansion valve, which sits right at the core
- Case foam seals that have crumbled
- Cabin filter replacement
How do we protect your interior?
Seats and carpet are covered before work begins. Fasteners are bagged and labeled by area. The airbag system is disabled following the maker's procedure, and the battery is handled so modules keep their settings where possible. Broken clips are replaced, since they cause rattles. If a second technician is needed to lift the dash out, we explain that before the clock starts.
Our evaporator core replacement process
Step 1: Approve the plan
You pick add-ons, and we confirm parts are on hand before teardown.
Step 2: Recover and drain
Refrigerant is recovered and coolant is drained, since the heater core shares the box.
Step 3: Remove and rebuild the box
The dash and HVAC case come out, the new core and seals go in, and doors are checked for smooth travel.
Step 4: Reinstall and recalibrate
The dash goes back, actuators are recalibrated, and modules are scanned for codes.
Step 5: Charge and road-test
Vacuum hold, charge by weight, coolant bleed and a road test over rough pavement finish the job.
What's included in evaporator core replacement
Included on the work order
- 01Seat and carpet protection
- 02Refrigerant recovery and coolant drain
- 03Dash and HVAC case removal and refit
- 04New evaporator core, seals and drier
- 05Actuator recalibration and module scan
- 06Vacuum hold, charge by weight, coolant bleed and road test
Is this a need-now repair?
Need now: call
- A leak so fast the system empties within days
- Refrigerant smell inside the cabin with the fan running
Need later: book
- A slow core leak that holds through a season with a recharge
- Planning the job for cooler months when you can spare the car
What sets the price and the look window?
Dash design sets the labor, and add-ons cost little extra time since the box is already open. We only promise what the board can hold and text you if it slips. AAA members save 10% on parts and labor, up to $75. When a leak cannot be pinned to the core yet, start with AC system leak detection.
What to check at pickup and after
Try every vent mode before you leave, and listen for rattles on rough roads that first week. Watch the coolant level for a few days, since the heater side was opened. Any issue goes to the front of the line. Clean coolant protects the heater core in that box, so keep up with radiator and coolant care.
Frequently asked questions
How long will my car be at the shop?
On many models, plan for a couple of working days, longer if a part is back-ordered. We give you a look window the board can hold, text you if it slips, and you can use the after-hours key drop to leave the car.
Why replace the drier too?
Once the system is opened for this long, the drier's moisture capacity is used up. A new one protects the new core and the compressor, so it is part of the standard job.
Will my radio and settings be lost?
Some presets may reset. We save what the procedure allows and recalibrate the climate actuators.